Heat treating furnace



Feb. 21, 1939. H. H. HARRIS HEAT TREATING FURNACE Filed Oct. 12, 1937 NTQR Harris ATTORNEYS the beating of said hollow tubes.

Patented Feb. 21, 1939 UNITED STATES PATENT OFFICE near TREATING FURNACE Henry E. Harris, Champaim, Ill. acclimation Ootober 12, 1937, serial No. i68,5dti

4 Claims.

on axis locates, or other containers, for travel ti furnace.

eating if'uruacec orehcat d by tubes 1 e secured to the aim, atio e iur riding either vertically or loo tudloaiiy These tubes are heated-by bui'bers the i of which cuteuti into the critic of 1 d in turn these tube. cart heat, by lotion and convection, to he .uriicce interior and hencethc furnace The tubes are it or over uh rue travelled, and it have found that "id oi heating the iurnace and i. e u ti? consumes a great amount of b tit: and tool, prolouge the process, and is time rather 1m-- satisfactory. The main object of my invention is to provide means; for reducing the time and fuel necessary to heat the charge or work being treated within the furnace, and performing the heat treating operation more quickly and efiioiently. I V

Another object of my invention consitts in the provision of a heat-treating furnace wherein the heating means are in close proximity to the work being treated.

A further object of my invention in the provision of a heat treating furnace "wherein hollow tubes are employed as work supporting means as well as heating means.

Broadly, I accomplish these objects, and related objects, by replacing the shds or roller rails, over which the furnace charge is conventionally travelled, by hollow tubes, and then provide for In the drawing annexed hereto andm'ad a. part hereof,

Figure 1 is a vertical section through a heat treating furnace showing one form of my invention in place therein;

Fig. 2 is a longitudinal section through a portion of the furnace shown the line Z--2 in plan; d Fig. 3 is a section along the line 3-4 of Fig. 2; and I Fig. 4 is a view, similar to Fig. 2, of a modified thereof, showing the furnace floor form of my invention. I

Referring to the drawing, reference numeral I...

in Figure 1 along indicates the furnace ceneraliy, which floor i2, side walls H, Maud roof M.

In the modification illustrated inFigures l to 3 inclusive, a plurality of hollow tubes lfl'are disposed crosswise or transversely through the furtrace it, said tubes; being: secured to furnace floor it. Each tube it has the nozzle of a burner projecting thereinto for heating the interior thereof. In ioi'ni shown, alternate burners it cutead into opposite ends of tubes it. Tubes it may he cubctahtiaily rectangular, as iiluctrated, or oi form being satisfactory. Tubes iii in diameter and thicitnesa than conventional, tubes used for heating, since in my intention the tubes serve two functions: one, to convey heab eithcr directly or by radia tioii -to the furnace charge, and two, to support the Weight the charlie during travel through the furnace.

tin the top of each tube it,

comprises preferably at the center oud at opposite ends thereof, it provide rail means im: .Wfllii; euphoria and travel. In the Figures 1 to 1-1 inclusive, I mount it, carrying a totui oi three rollers mounted on each tube; the roller rail sections being secured at right angles to the tube and extending loritritudinally or lengthwise the furnace and forming a track on which the Work is travelled through the furnace. The-sections 22 illustrated are short, being of a. length substantially equal to the width of tube l8. It is ob- -vious that roller rail sections of length to extend over two, three or even more tubes may be used, and, also that if desired, ordinary skid rails may be utilized to support the work on the tubes during travel through the furnace. For purposes of convenience, I will include both roller rails and skid rails within the term rails as sam is employed in the appended claims.

Referring to the modified form of my invention illustrated in Fig. 4, hollow rectangular tubes 28 are disposed and arranged on floor I! of furnace lfl extending longitudinally thereof. In this modification,"roiler rail sections 32 are shown disposed on top of tubes 28, longitudinally aligned there-. with and extending lengthwise of the furnace. Rail sections 32 may be continuous, instead of short lengths as in the form of the invention '11- lustrated in Figures "1 to 3. Rollers may be dispensed with, if desired, and the work travelled ed tubes not only make direct contact with the work being treated passing thereover, but also radiate heat to the work, and the work being in such close proximity to the heat source, the time needed to bring the work to the desired heat is materially reduced. A shorter period of time is needed to complete the heat treatment and this, with the saving in fuel, makes the heat treating operation very economical as practised with my invention.

Having described my invention, what I claim and desire to secure by Letters Patent is;

1. In a heat treating furnace comprising a floor, a pair of side walls and a roof, means to convey heat to the interior of said furnace comprising a plurality of tubes disposed within the furnace and on the furnace floor, and means to support work within the furnace during travel therethrough, the work supporting means being disposed and secured directly on upper surfaces of the heat conveying means.

2. In a heat treating furnace comprising a floor, a pair of side walls and a roof, means to support work within said furnace during travel therethrough, and means within said furnace to convey heat to said work, said heating means comprising a plurality of hollow tubes disposed within said furnace and on the floor thereof, and said work supporting means comprising rails disposed and secured on the top of said tubes.

3..A heat treating furnace as in claim 2 in which the hollow tubes are disposed transversely of the furnace and the rails are secured thereon at right angles thereto.

4. A heat treating furnace as in claim 2 in HENRY H. HARRIS. 

